package common;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtil {
    private static final String URL="jdbc:mysql://127.0.0.1:3306/oj_database?characterEncoding=utf8&useSSL=false";
    private static final String USERNAME="root";
    private static final String PASSWORD="123456wjh.";
    private static DataSource dataSource=null;
    private static DataSource getDataSource(){
        if (dataSource==null){
            synchronized (DBUtil.class){
                if (dataSource==null){
                    MysqlDataSource mysqlDataSource=new MysqlDataSource();
                    mysqlDataSource.setURL(URL);
                    mysqlDataSource.setUser(USERNAME);
                    mysqlDataSource.setPassword(PASSWORD);
                    dataSource=mysqlDataSource;
                }
            }
        }


        return dataSource;
    }
    public static Connection getConnection() throws SQLException {
        return getDataSource().getConnection();
    }
    public static void close(Connection connection, PreparedStatement statement, ResultSet resultSet) throws SQLException {
        if (resultSet!=null){
            resultSet.close();
        }
        if (statement!=null){
            statement.close();
        }
        if (connection!=null){
            connection.close();
        }
    }
}
